import turtle as t
length=int(input("请输入边长"))
t.setup(8000,8000,0,0)

t.color("red","yellow")
t.speed(8)
i=1
t.begin_fill()
while i<=50:

    t.fd(length)
    t.right(100)
    i=1+i
t.end_fill()



t.done()